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Possible match

Injury collision

Possible injury collision near Grand Ave on-ramp

October 9, 2026 · 2:46 PM

  • black Mercedes-Benz
  • gray Mazda
  • Grand Ave on-ramp
  • SR-57

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What the source reported

At approximately 2:46 PM, dispatch information described a collision involving a black Mercedes-Benz and a gray Mazda on SR-57 southbound near Grand Ave Onr in Diamond Bar. A vehicle was reported on an on-ramp. Dispatch notes indicate an ambulance responded.

Written from the CHP dispatch record below. Dispatch notes reflect what was reported at the time and can be incomplete or later corrected.

See complete source detailsTimeline, dispatch log, and record data

Vehicle details

Vehicles reported

black Mercedes-BenzBlack
gray MazdaGray
  • on an on-ramp

What happened, step by step

  1. 2:48 PMCollision reportedDispatch notes describe a black Mercedes-Benz and a gray Mazda.
  2. 2:58 PMScene clearedAs logged21C 97 //RDWY CLR ALL VEH ON RS
  3. 3:04 PMMedical responseAs logged[FSP]-21C // ROLL 1141 WB 60 JWO GRAND // NEAR GRAND ONR
  4. 3:05 PMIncident reclassifiedFreeway Service Patrol reported Changed from collision reported with no injuries to collision with an ambulance responding.
  5. 3:05 PMAnother agency contactedAs logged1039 LACOFD INC 6717 ****************
  6. 3:10 PMIncident reclassifiedChanged from collision reported with no injuries to collision with an ambulance responding.
  7. 3:16 PMIncident reclassifiedChanged from collision with an ambulance responding to collision reported with minor injuries.
  8. 3:17 PMScene clearedAs logged2 VEH 1181 - COP
  9. 3:29 PMScene clearedAs logged[FSP] has closed their incident [261009LAFSP0135]

Every entry in the dispatch record below is represented here.

Dispatch log

17 entries

Combined from more than one CHP dispatch record: 261009LA1718 · 261009LAFSP0135

  1. +0:0014:48[1] BLK MERZ VS GRY MAZD VS WHI VEH ON NARROW RS
  2. +0:0014:48BLK MERZ VS GRY MAZD VS WHI VEH ON NARROW RS
  3. +0:1014:5821C 97 //RDWY CLR ALL VEH ON RS
  4. +0:1014:5821C 97 //RDWY CLR ALL VEH ON RS
  5. +0:1615:04[FSP]-21C // ROLL 1141 WB 60 JWO GRAND // NEAR GRAND ONR
  6. +0:1615:04[FSP]-21C // ROLL 1141 WB 60 JWO GRAND // NEAR GRAND ONR
  7. +0:1715:05[FSP]-Problem changed from 1182-Trfc Collision-No Inj to 1179-Trfc Collision-1141 Enrt by FSP
  8. +0:1715:051039 LACOFD INC 6717 ****************
  9. +0:1715:05[FSP]-Problem changed from 1182-Trfc Collision-No Inj to 1179-Trfc Collision-1141 Enrt by FSP
  10. +0:1715:051039 LACOFD INC 6717 ****************
  11. +0:2215:10Problem changed from 1182-Trfc Collision-No Inj to 1179-Trfc Collision-1141 Enrt by CHP
  12. +0:2215:10Problem changed from 1182-Trfc Collision-No Inj to 1179-Trfc Collision-1141 Enrt by CHP
  13. +0:2815:16Problem changed from 1179-Trfc Collision-1141 Enrt to 1181-Trfc Collision-Minor Inj by CHP
  14. +0:2815:16Problem changed from 1179-Trfc Collision-1141 Enrt to 1181-Trfc Collision-Minor Inj by CHP
  15. +0:2915:172 VEH 1181 - COP
  16. +0:2915:172 VEH 1181 - COP
  17. +0:4115:29has closed their incident [261009LAFSP0135]

About this information.

This page is generated automatically from publicly available California Highway Patrol computer-aided dispatch (CAD) data. Dispatch information is preliminary and unverified. It may contain errors, and it may change as an incident develops. This page is not an official collision report, and no official collision report is available on this website. Dispatch data does not identify any person involved in this incident, and no individuals are identified on this page. To request the official collision report, follow the agency instructions below.

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